Coscup2021 open source network os for datacenter
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Open Source Network OS for Datacenter summarizes SONiC, an open source network operating system for datacenters. Key points include: - SONiC uses a spine-leaf topology and supports VxLAN overlay networking with MP-BGP EVPN control plane. - It has a modular architecture with components like SWSS for state synchronization, Orchagent for state processing, and SAI for hardware abstraction. - Applications communicate through Redis databases and netlink messaging. Orchagent acts as a consumer and producer to process state between databases.
![Supervisor: A Process Control System
- https://github.com/Supervisor/supervisor.git
- Supervisor daemon (dockers/docker-orchagent/supervisord.conf)
- [program:orchagent]
- command=/usr/bin/orchagent.sh
- priority=4
- autostart=false
- autorestart=false
- stdout_logfile=syslog
- stderr_logfile=syslog
- dependent_startup=true
- dependent_startup_wait_for=portsyncd:running
- Critical Process Listener
- files/scripts/supervisor-proc-exit-listener
- configuration: /etc/supervisor/critical_processes](https://image.slidesharecdn.com/coscup2021opensourcenetworkosfordatacenter-210731074601/85/Coscup2021-open-source-network-os-for-datacenter-9-320.jpg)
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Coscup2021 open source network os for datacenter
- 1. Open Source Network OS for Datacenter Dung-Ru Tsai, COSCUP2021
- 2. OCP Ecosystem with SONiC https://github.com/Azure/SONiC/wiki/files/talks/SAI-SONiC-OCP-Summit-Mar16-shared.pdf
- 3. Nowadays, Datacenter Network: Spine Leaf Topology https://www.cisco.com/c/en/us/products/collateral/switches/nexus-7000-series-switches/white-paper-c11-737022.html
- 6. Control-Plane Address Learning: MP-BGP EVPN https://www.ciscolive.com/c/dam/r/ciscolive/emea/docs/2016/pdf/LTRDCT-2223.pdf
- 7. SONiC Subsystem Architecture High Level View https://github.com/Azure/SONiC/wiki/Architecture
- 9. Supervisor: A Process Control System - https://github.com/Supervisor/supervisor.git - Supervisor daemon (dockers/docker-orchagent/supervisord.conf) - [program:orchagent] - command=/usr/bin/orchagent.sh - priority=4 - autostart=false - autorestart=false - stdout_logfile=syslog - stderr_logfile=syslog - dependent_startup=true - dependent_startup_wait_for=portsyncd:running - Critical Process Listener - files/scripts/supervisor-proc-exit-listener - configuration: /etc/supervisor/critical_processes
- 10. Switch State Service (SWSS) The SWitch State Service (SWSS) is a collection of software that provides a database interface for communication with and state representation of network applications and network switch hardware.
- 11. sonic-swss-common - Communication with REDIS - DBConnector: set up DB connection. - RedisPipeline: producer to database - RedisTransactioner: database to subscriber (consumer) - swss::ProducerStateTable ⇐ TableBase - Producer Destination table - swss: SubscriberStateTable ⇐ ConsumerTableBase - Consumer source table - NetDispatcher: Register Netlink message and handler
- 13. class Select
- 14. Where the “Selectable” (fd) come from ? vector<string> cfg_vlan_tables = { CFG_VLAN_TABLE_NAME, CFG_VLAN_MEMBER_TABLE_NAME, }; - DBConnector cfgDb("CONFIG_DB", 0); get the redis socket fd. - std::vector<Orch *> cfgOrchList = {&vlanmgr}; - VlanMgr vlanmgr(&cfgDb, &appDb, &stateDb, cfg_vlan_tables); - Orch(cfgDb, tableNames) - Orch::addConsumer(db, it, default_orch_pri); - Orch::addExecutor(new Consumer(new SubscriberStateTable(db, tableName, TableConsumable::DEFAULT_POP_BATCH_SIZE, pri), this, tableName)); - SubscriberStateTable::SubscriberStateTable(DBConnector *db, const string &tableName, int popBatchSize, int pri) - class SubscriberStateTable : public ConsumerTableBase : ConsumerTableBase:RedisSelect:Selectable - void RedisSelect::psubscribe(DBConnector* db, const std::string &channelName)
- 15. Class Orch : Handle multiple consumer source table Binding - DB table - doTask function
- 16. class Execuator
- 18. SWSS: Config Manger - Mangers are table consumer and produce netlink message to kernel - coppmgrd - vlanmgrd - intfmgrd - portmgrd - vrfmgrd - nbrmgrd - vxlanmgrd - tunnelmgrd - lldpmgrd (In LLDP Container)
- 19. SWSS: *syncd - Direction: Receive Netlink message and push new data to the APPL_DB - SWSS CNTR: portsyncd, neighsyncd, fdbsyncd - BGP CNTR: fpmsyncd - teamd CNTR: teamsyncd - LLDP: lldp_syncd
- 20. Switch State Service: Orchagent ● The most critical component in the Swss subsystem. ● Orchagent contains logic to extract all the relevant state injected by *syncd daemons, process and message this information accordingly, and finally push it towards its south-bound interface. ● Orchagent operates both as a consumer (for example for state coming from APPL_DB), and also as a producer (for state being pushed into ASIC_DB).
- 23. orchdaemon.cpp --------------------------------------------- ret = m_select->select(&s, SELECT_TIMEOUT); if (ret == Select::ERROR) { SWSS_LOG_NOTICE("Error: %s!n", strerror(errno)); continue; } if (ret == Select::TIMEOUT) { continue; } auto *c = (Executor *)s; c->execute(); select.cpp -------------------------------------------- int Select::poll_descriptors(Selectable **c, unsigned int timeout) { int sz_selectables = static_cast<int>(m_objects.size()); std::vector<struct epoll_event> events(sz_selectables); int ret; do { ret = ::epoll_wait(m_epoll_fd, events.data(), sz_selectables, timeout); } while(ret == -1 && errno == EINTR); // Retry the select if the process was interrupted by a signal orch.cpp